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x in (-oo:+oo)
6/7 = (-6/7)*x // - (-6/7)*x
6/7-((-6/7)*x) = 0
(6/7)*x+6/7 = 0
6/7*x+6/7 = 0 // - 6/7
6/7*x = -6/7 // : 6/7
x = -6/7/6/7
x = -1
x = -1
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